Hydrogen has only one proton, but its IE1 is much greater than that of lithium, which has three protons. Explain.

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Ionization energy is defined as the energy required to remove
the outermost electron from an atom. The further the outermost
electron is from the nucleus, the less energy is required to remove
it from the attractive force of the nucleus. In hydrogen, the
outermost electron is in the n = 1
level and in litliium the outermost electron is in the n = 2 level. Therefore, the outermost electron in
litliium requires less energy to remove, resulting in a lower
ionization energy.

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